contaminated water; polluted water; dirty water
Refers to water that has been contaminated, often by industrial waste, radiation, or sewage. Commonly used in environmental and disaster contexts.
The treatment of contaminated water at the Fukushima Daiichi Nuclear Power Plant has become a major issue.
Contaminated water flowed from the factory into the river.
Compound of 汚染 (osen, 'pollution') and 水 (sui, 'water').